function std_array = GetPdrStdArray( file_name )
  std_array=[];
  f_id = fopen (file_name);
  %data = importdata (['link_txrx_status.txt']);
  link_index = 1;
  while feof (f_id) == 0
      line = fgetl (f_id);
      %line = fgetl (f_id);
      rx = str2num (line);
      std_array = [std(rx); std_array];
      link_index = 1 + link_index;
  end
  fclose (f_id);
end
